Fabrication and characterization of high-Q silicon nitride membrane resonators

TL;DR

This paper provides a detailed tutorial on designing, fabricating, and characterizing high-Q silicon nitride membrane resonators, emphasizing their importance in optomechanics and offering practical guidance for researchers.

Contribution

It offers a comprehensive, step-by-step tutorial on creating and analyzing high-Q silicon nitride membrane resonators, which is valuable for researchers in the field.

Findings

Achieved Q-factors greater than 10^8 in torsion modes.

Demonstrated fabrication techniques for centimeter-scale Si3N4 nanoribbons.

Provided a practical guide for optomechanics researchers.

Abstract

Silicon nitride membranes are a powerful and ubiquitous optomechanical resonator technology, enabling high mechanical Q, low optical loss, and enhanced optomechanical coupling via a panoply of strain-, phononic-, and photonic-crystal engineering techniques. Fabrication and characterization of silicon nitride membranes has become a form of tacit knowledge in optomechanics research groups. Here we present a video run-through of the design, fabrication, and characterization of a contemporary silicon nitride membrane resonator (specifically, a centimeter-scale Si3N4 nanoribbon supporting $Q>10^8$ torsion modes). Our tutorial can serve as a starting point or refresher for practitioners in the field.